The California legislature began recording selected floor debates and committee hearings in the late 1980s.
The Senate and Assembly post links to upcoming video and audio streams of their proceedings:
Recordings of recent floor debates and committee hearings are available online:
Older floor debates and committee hearings can be purchased from the California State Archives:
In searching for audio and video, you may run across references to CalChannel, a television channel that broadcast California legislative proceedings from 1993 to 2019. CalChannel closed in 2019: